I have one particular open source project that I started back in college that's actually paid off a little bit over the years as it's become more mature. In tot

I have one particular open source project that I started back in college that's actually paid off a little bit over the years as it's become more mature. In total, I've probably received ~$20k between custom development and commercial licenses (it's AGPL, so option #2 in the article). However, given the amount of time I've put into it, it still pays less than my current job, and probably even most of the jobs I had in college. Most of my other open source work gets released as MIT and I have zero expectation of getting any direct money from it. (Although, my open source work has undoubtedly helped me get my current and most of my recent jobs, so there is a fair argument that it's earning me money indirectly.)